基于增益诱导光纤激光器的实验研究及理论分析

Experimental research and theoretical study based on gain-guided soliton pulse fiber laser

利用非线性偏振旋转技术,实现了正色散掺铒光纤激光器的自启动锁模,产生了一种新型的增益诱导孤子脉冲输出.该类型脉冲的光谱近似为矩形,半高全宽光谱宽度可达19 nm以上,脉宽为皮秒量级.增益诱导孤子脉冲的形成是增益饱和、光谱滤波效应、腔内色散和各种非线性效应共同作用的结果.同时还分析了脉冲啁啾特性及峰值功率等参数.当抽运功率增加时,该激光器还可以实现双脉冲模式下运转.

We use nonlinear polarization rotation technology to realize the self-start passive mode-locking in the erbium-doped fiber ring laser of positive dispersion, which can generate a new kind of gain-guided soliton pulse. The laser generates picosecond pulses with a rectangular-shaped spectrum, the FWHM width of which can be greater than 19 nm. The gain-guided soliton formation mechan/sm may include laser gain, spectral filtering effect, cavity dispersion and other fiber nonlinear effects. In this paper we also study the chirp property, peak power and other parameters of the pulse. With further increasing the pump power, the laser can operate on dual-pulse output mode.